Ptolemy III Euergetes

Ptolemy III Euergetes (284 BC-222 BC) was Pharaoh of Ptolemaic Egypt from 246 to 222 BC, succeeding Ptolemy II Philadelphus and preceding Ptolemy IV Philopator.

Biography
Ptolemy was the son of Ptolemy II Philadelphus and Berenice I, and he succeeded his father as Pharaoh of Egypt on his death in 246 BC. Ptolemy married outside the family, unlike his father (who remarried to his sister Arsinoe II). There was a short-lived rebellion soon after his accession to the throne, but it was quickly crushed, and Ptolemy went on to found the Serapeum. Ptolemy continued his father's policy of subduing Macedon through supporting its enemies, supporting the Achaean League before switching his support to Sparta due to its better position to fight against Macedon. The Ptolemaic Kingdom reached the height of its power during Ptolemy's reign, occupying Antioch and reaching Babylon during a war with the Seleucids of Syria. He died in 222 BC and was succeeded as Pharaoh by his son Ptolemy IV Philopator.